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Explanation: W tatami papier japoński pokrywa warstwę słomy/sitowia ryżowego
"Will the igusa (rush covering) colour age? How about the special Japanese paper covering?
Yes. When delivered, the igusa will look fairly green (more so with the higher grades) in colour. The colour will eventually fade to a yellowish or whitish hue, especially if placed in direct sunlight. The paper will also fade but to a lesser extent."